One thing to remember is I want Fatigue to govern most abilities. So you can if you want push your character to move farther, attack harder, or using special abilities uses Fatigue such as special moves, magic, etc. When you use your Fatigue you move your gear down, as the gear moves down your other abilities automatically go down as well so the next turn you won't be able to move as far, attack/defend as well. However it does not stop you from using your miniature the next turn nor does it cause you any damage in any way.
Fatigue will regenerate +1 for every 2 turns if you use the miniature or +1 per turn if they rest.